Lionel has given you the information from the LDS labs pilot website - thanks Lionel - but this pilot (trial) website has some differences in film numbers from the LDS Family History Library Catalog, so needs double-checking.

For example, in the baptism for Eliza Jane Costain the first available film number is given for St Matthews, Douglas, rather than the second (later) dates.
The Catalog reads:
Title Parish register transcripts of St. Matthew's Church (Douglas), 1705-1883.
Authors Church of England. St. Matthew's Church (Douglas, Isle of Man) (Main Author)
Baptisms, 1705-1848 Marriages, 1730-1753 FHL BRITISH Film 106718.
Christenings, 1849-1883 FHL BRITISH Film 106186 Item 1.

So, going by this, it would be safer to order film no. 0106186 for an 1849 bapt. It might have 1849 on both films, but that isn't what it has in their current Catalog. It isn't a disaster if you receive a "wrong" film - they are very cheap to hire (amount differs in each country) - just frustrating. You usually have a month to view them in the local FHC.

It is the same with the 1878 Malew marriage. If you look at the IGI the extracted record clearly shows under "Source Call No." 1849 - 1883 0106192 Film.
If you click on that film number [0106192] it takes you to the Catalog, showing "Parish register transcripts of Kirk-Malew, 1649-1883. Church of England". Click on this, then "View Film Notes".
"Christening, marriages, burials 1849-1883 FHL BRITISH Film 106192"

Looking at the rest of the list you can see that the Source Film Number: 106732 given by the pilot website is described as "Marriages 1788-1848 Burials 1788-1849 Index to christening, marriages 1784-1849 FHL BRITISH Film 106732" which, unless it has been refilmed and changed, would not include an 1878 marriage. In which case one would expect them to have changed their Catalog entry as well, and/or to have chosen a different film number for a recent filming.

I think it is safer to stick with the film numbers where you can be sure the IGI extracted entry originated.

Sue